Eccrine hidrocystomas are prevalent in adults between 30 and 70 years of age. Solitary eccrine hidrocystomas are equally prevalent among males and females; however, the multiple eccrine hidrocystomas are mainly seen in female patients.
Apocrine hidrocystomas affect the same age groups as do eccrine hidrocystomas, and rarely occur during childhood or adolescence. They can appear as single or multiple cystic lesions. Although a significant number of cases of multiple apocrine hidrocystomas have been reported in the literature, the multiple type is rare in the general population.
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Cite this: Hidrocystomas - A Brief Review - Medscape - Sep 05, 2006.